A rescue worker walks down a makeshift plywood path carrying a personal item past the twisted wreckage of a car and very other debris while working at the mudslide site Sunday afternoon near Oso, Wash., March 30, 2014. (AP Photo /The Herald, Annie Mulligan)
A rescue worker walks down a makeshift plywood path carrying a personal item past the twisted wreckage of a car and very other debris while working at the mudslide site Sunday afternoon near Oso, Wash., March 30, 2014. (AP Photo /The Herald, Annie Mulligan)
AP

The Washington Medical Examiner’s office confirmed that rescue crews discovered four additional fatalities in their search for Oso Mudslide survivors Sunday.

The announcement brings the unofficial total death toll to 25, with 30 others still missing.

The Associated Press reports:

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The search by heavy equipment, dogs and bare hands for victims from the deadly Washington mudslide was going "all the way to the dirt" as crews looked for anything to provide answers for family and friends a week after a small mountainside community was destroyed.

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Finding and identifying all the victims could stretch on for a very long time, and authorities have warned that not everyone may ultimately be accounted for after one of the deadliest landslides in U.S. history.

Rescuers have given a cursory look at the entire debris field 55 miles northeast of Seattle, said Steve Harris, division supervisor for the eastern incident management team. They are now sifting through the rest of the fragments, looking for places where dogs should give extra attention. Only "a very small percentage" has received the more thorough examination, he said.

Dogs working four-hour shifts have been the most useful tool, Harris said, but they're getting hypothermic in the rain and muck.